package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisConstants;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result queryTypeList() {

        List<ShopType> typeList;
        String key = RedisConstants.CACHE_SHOP_KEY + "typeList";

        //1、查询redis中是否存在
        List<String> cacheList = stringRedisTemplate.opsForList().range(key, 0, -1);
        if (cacheList != null &&!cacheList.isEmpty()){

            typeList = cacheList.stream()
                    .map(json ->{
                        return JSONUtil.toBean(json,ShopType.class);
                        })
                    .collect(Collectors.toList());
            //2、存在直接返回
            return Result.ok(typeList);

        }

        //3、不存在，查询数据
        typeList = query().orderByAsc("sort").list();
        if(!typeList.isEmpty()){
            List<String> jsonList = typeList.stream().map(JSONUtil::toJsonStr).collect(Collectors.toList());
            //4、存储在redis中
            stringRedisTemplate.opsForList().rightPushAll(key,jsonList);
        }

        //5、放回
        return Result.ok(typeList);
    }
}
